Stop mechanism for driving-shafts



(No Model.)

F. M. ROOTS.

STOP MECHANISM FOR DRIVING SHAFTS.

Patented Sept. 21, 1886.

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- N. PETERS. Phoivlflhognqahun \Nahingwm D. C.

UNITED STATES PATENT OFFICE.

FRANCIS M. ROOTS, OF OONNERSVILLE, INDIANA.

STOP MECHANISM FOR DRlVlNG-SHAFTS.

SPECIFICATION forming part of Letters Patent No. 349,362, datedSeptember 21, 1886.

Application filed January 19, ISEG. Serial No. 189,058. No model.)

To all whom it may concern:

Be it known that I, FRANCIS M. ROOTS, a citizen of the United States,and a resident of Gonnersville, in the county of Fayette and State ofIndiana, have invented a certain new and useful Improvement in StopMechanisms for Driving-Shafts, of which the following is aspecification.

The object of myinvention is to provide a simple, positive, and reliablestop to prevent driving-shafts from turning backward.

My invention is especially applicable to hand-blowers for forges, 850.,to prevent the backward motion of the pistons, which would draw ashes,cinders, or gases into the blowercase. These ashes and cinders cut andinjure the contact-surfaces, and the gases frequently cause explosionswhich destroy the blowers.

The invention is also applicable to various devices in place of theratchet and pawl generally used, and has the advantage of insuring aninstantaneous stop and preventing the slightest backward movement.

\Vith this object in view my invention 0011 sists in arranging avibrating arm, which is pivoted to a stationary object outside the axisof rotation, the end of the arm bearing upon a flange 0r rim of thedriving-wheel, or a wheel mounted upon the driving-shaft, the saidarm,when resting upon the rim or flange, being at an angle to aradialline drawn through its pivot.

It also consists in certain details of construction and combination ofparts, all of which will be fully described in connection with theaccompanying drawings, in which like parts are indicated by similarreferenceletters wherever they occur in the various views, andparticularly referred to in the claims.

In the accompanying drawings, Figure 1 is a side elevation of myimprovement as applied to one of my blacksmiths blowers. Fig. 2 is avertical section of the same through line no as of Fig. 1, looking inthe direction of the blower, which in this view is removed.

To the top of the blower-case A is secured the arm B, which carries atits upper end the j ournal-pin 0, upon which the driving sprocket-wheelD is mounted.

The construction of the blower and sprockets and chain for driving thesame is well known, and is therefore not specifically described herein,except in so far as is necessary to a clear understanding of my stopdevices. 1

To the standard B is loosely pivoted a swinging arm, E, which drops downat an angle to a radius drawn through the pivot upon which the arm E isjournaled. The lower end of this arm rests upon a flange, a, whichprojects out from one side of the driving-wheel D. This flange is shownin dotted line in Fig. 1 of the drawings. The lower end of the arm E isprovided with a transverse dovetail groove, within which is compressed ashoe of hard rubber, wood, leather, or other suitable noiselessmaterial, which rests upon the flange.

The direction of the wheel is indicated by an arrow. It will be seenthat while the arm E in no way interferes with the free rotation of thewheel in its proper direction, and will be noiseless when the wheel isso revolved, it will yet absolutely prevent any backward movement. \Vhenthe blower is driven by a belt instead of the sprocket-chain, as shownin the drawings, the arm E will rest upon the rim of the pulley. Thepulley in this case would require nochange whatever; but when thesprocket-wheel is used the flange a is necessary.

It is obvious that the stop-arm E, instead of being pivoted to thestandard or arm which supports the driving-wheel, may be pivoted to anystationary object, and it is immaterial whether it depends, as shown inthe drawings, or inclines above its pivot-pin, so longas it is at suchan angle to the radius as to permit the free rotation of the wheel inone direction and instantly arrests it when attempted to be moved in theother direction.

I am aware it is not broadly new to provide brake mechanism to preventwheels and shafts from turning backward.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination, substantially as specified, of the standard 13 andwheel D, mounted upon the pin 0 in said standard, the said wheel havinga flange, c, with the arm E, pivoted to said standard B, and having itsfree end as shown and described.

2. The combination, substantially as specified, of the driving-Wheel D,having flange a, 5 the arm E, pivoted on a stationary object at\Vitnesses:

resting on the flange of wheel D, substantially I vided at its free endwith a dovetail groove,

and a friction-shoe held within said groove, for the purpose set forth.

FRANCIS l\l.. ROOTS.

one end and having its opposite end in proximity to the flange, the saidarm E being pro- GEo. J. MURRAY, EDGAR OITAIR.

